I have only tried the email verification service and have had much better success with it than some of the other services I have purchased. I sent a list through that a competitor claimed was almost 80% invalid, they came back as 90% valid. So, to double check, I tried some of the supposed invalid emails from the first list and the emails all worked, so BrandNav was more accurate. And accuracy is all that counts. I feel confident using them to clean my lists. This gives me reason to branch out and try their other offerings as well.